Prosopis affinis Smith, 1853:168, ♂♀. ♂, ♀, North America (leg. E. Doubleday, Esq.). - Cresson, 1872Cresson, E.T. 1872. Hymenoptera Texana. Transactions of the American Entomological Society 4:153-292. (distribution). - As Hylaeus affinis: - Meade-Waldo, 1923Meade-Waldo, G. 1923. Hymenoptera, fam. Apidae, subfam. Prosopidinae. Genera Insectorum 181:1-45. (distribution); Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538. (distribution); Snelling, 1966Snelling, R.R. 1966. Studies on North American bees of the genus Hylaeus. 1. Distribution of the western species of the subgenus Prosopis with descriptions of new forms (Hymenoptera: Colletidae). Contributions in Science, Natural History Museum Los Angeles County 98:1-18. (distribution); Owens et al., 2018Owens, B.E., L. Allain, E.C. van Gorder, J.L. Bossart & C.E. Carlton 2018. The bees (Hymenoptera: Apoidea) of Louisiana: An updated, annotated checklist. Proceedings of the Entomological Society of Washington 120 (2):272-307. (distribution).
Prosopis ziziae Robertson, 1896:136 Synonymized with Hylaeus affinis (Smith, 1853) by Mitchell, 1960Mitchell, T.B. 1960. Bees of the Eastern United States. Volume I. Technical bulletin (North Carolina Agricultural Experiment Station) 141:1-538.:63. - Lovell, 1909Lovell, J.H. 1909. The bees of Virginia - Prosopis, Sphecodes, Osmia. Entomological News 20:412-417. (distribution); Metz, 1911Metz, C.W. 1911. A revision of the genus Prosopis in North America. Transactions of the American Entomological Society 37:85-156. (distribution); Snelling, 1966Snelling, R.R. 1966. Studies on North American bees of the genus Hylaeus. 1. Distribution of the western species of the subgenus Prosopis with descriptions of new forms (Hymenoptera: Colletidae). Contributions in Science, Natural History Museum Los Angeles County 98:1-18.:3 ( listed as synonym of Hylaeus affinis (Smith, 1853)); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1761 ( listed as synonym of Hylaeus affinis (Smith, 1853)). - As Hylaeus ziziae: - Michener, 1947Michener, C.D. 1947. Bees of a limited area in southern Mississippi (Hymenoptera; Apoidea). The American Midland Naturalist 38 (2):443-455. (distribution). - As Prosapis ziziae: - Cockerell, 1898Cockerell, T.D.A. 1898. The North American bees of the genus Prosapis. The Entomologist 31:185-192. (distribution).
Prosapis ziziae dunningi Cockerell, 1898:188, ♂. Holotype ♂, Volga, S. D. (leg. S.N. Dunning). Synonymized with Hylaeus affinis (Smith, 1853) by Snelling, 1966Snelling, R.R. 1966. Studies on North American bees of the genus Hylaeus. 1. Distribution of the western species of the subgenus Prosopis with descriptions of new forms (Hymenoptera: Colletidae). Contributions in Science, Natural History Museum Los Angeles County 98:1-18.:3. - As Prosopis ziziae dunningi: - Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1761 ( listed as synonym of Hylaeus affinis (Smith, 1853)).
Hylaeus albertensis Cockerell, 1937:126 Synonymized with Hylaeus affinis (Smith, 1853) by Snelling, 1966Snelling, R.R. 1966. Studies on North American bees of the genus Hylaeus. 1. Distribution of the western species of the subgenus Prosopis with descriptions of new forms (Hymenoptera: Colletidae). Contributions in Science, Natural History Museum Los Angeles County 98:1-18.:3. - Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1761 ( listed as synonym of Hylaeus affinis (Smith, 1853)).